4 ideas
In 1990s Northumberland, seventeen-year-old Silvie is taken by her abusive bus-driver father Bill to live 'as Iron Age Britons' for a week with archaeology professor Jim Slade and three students. Only Molly, a student from the south who has refused to treat the violence as normal, breaks the camp's isolation and brings help.
A ghost wall is a barrier hung with the skulls of ancestors, built by Iron Age tribes to call on the dead to repel Roman invaders. The novel uses it as the image of nativist politics: the claimed purity of the nation is held up by the dead and by fear, not by any living defence. The wall's real target is whoever inside the group can be recast as a threat.
When a group treats the past as more real or pure than the present, the rules it invokes become cover for violence the present would forbid. The father's hunger for an 'uncontaminated' ancient Britain is inseparable from his hunger for a world where no wife, daughter, or outsider may contradict him. Re-enactment turns his private tyranny into a role everyone agrees to play.
Watch who has the standing to stop harm and instead treats it as interesting. In this reading, harm needs the educated observer's quiet assent as much as it needs the man who strikes.